package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

import static com.sky.constant.AutoFillConstant.*;

/**
 * 自定义切面，统一处理公共字段
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut() {
    }

    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始统一处理公共字段");

        //获取当前被拦截的方法上数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取当前被拦截的方法上的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        Object entity = args[0];
        log.info("当前操作类型：{}",operationType);

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同操作类型，给实体对象赋值

        if (operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);

                //通过反射赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);

                //通过反射赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

}
